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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a459e92398475b4f172772c9f52be8982697f012508af70cf7b690317a841fa7' 
  AND token = 'h1b6EwGGB2aUlBY5CmqcOfhgtAdWj3eXni1MCE6DG7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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