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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d53244b5bf66b4bf10d7f13286318941b7ef504d4ef893f883a491680b17150' 
  AND token = '0V8A9dTBj39Pu1+1xYsWo/Kp+Ev6e1N+ScpFYTYCXGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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