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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08fad921d620dbf1ab127dff3ef53dc37266f8acf24f3fa7bf9b02189c4292bb' 
  AND token = 'qr4C8BSfCWe+pUfFEwVxOiKLm3xzQLVPqtMuHdKODAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}