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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0509622efd63a8ea5ee934bff29be5a83d7accc17af7e3164a061fa8b5b1c4ab' 
  AND token = 'vOJW+wI7AXeu+6PAApslcIarvHiRzOpaSGSH+pTvj7Y=' 
  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"
    }
  }
}