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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7587fae26bddc190a26cda7e3dafd0e2552574b965267eeb1a8326ccbceed27' 
  AND token = 'KZg2R2Gq3wfjWeFLw5kD2nfJxBFXwW03Yic458kxt8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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