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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e636e58cc36ebd3261f729e4e8b36b1e251a72a890dd466e510b96a8e271885' 
  AND token = '3BO/cz0UaH1RDKJZWeUAGwOcA+jbWSXjC9/d/yrYoNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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