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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd082b19876a1437b4184c52ef83e59f444761c2ddb75d1e87d65a8a11443e781' 
  AND token = 'N5cm9vbkTEDlj2R4sxVCAnP98eqYnLYNygnGLBuzxI0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00067

JSON explain

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