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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4edca5a77558e3dd8ea9796a58165b4fed00f16a0fac8b5464f955d90666644a' 
  AND token = 'wCwXNhMf/x4WwRUzp5RRqunvNjbLOq+29rtMl6y6ymI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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