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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '659fb8b545ee88f06d9fbf93a5f11f077f204851cad0af0dfcf0b2783b57f452' 
  AND token = 'gljmjxZN7oyi6MpwX43+a6owTi9yw506ovh310QseQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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