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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '337954e5c6bdd2af4d4d97cc8591431c9efe24ccb7f156186a1c8664da13d2f1' 
  AND token = '5fNs8VEqZd2+fjBb+ecJkWz/e6yIxqEdsQRDcxu+6Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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