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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e84d71f0d6624a7e2d695e3a2c43a29e7e18c39240753ea6344d8e0f2a0f075d' 
  AND token = 'PR7UFlPP5J9EkKlmddfTaPLdz9OmLUyNfsjEg76vCeU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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