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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5661bb3ff843c7db61d281f29756a8126fcb2f2fceced7c45355853d93611ac3' 
  AND token = '9BApkz6bGJveaTlilM4ajAyDFrHvjA9n4fDZW0YyiRQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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