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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ca6b64d8297724e3bf51ee427af34b722b9356bff826885b0c1295827d843b6' 
  AND token = '+i9JoLEZ41yTsBc8y5Cd9hlG+9svryqBwuQWQeWhH2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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