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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd22ace59c4570947ceeea5064cc79bb01f841c60e03149010f7043ac5c1f328' 
  AND token = 'SO3aqQagEp5foMD2ZPCrDJ9T2bkpJVZFHhdhawrNVHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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