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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3053fb9ffbe8dcbbea74318c2ec9bb16eebd8ce9480253fcc47993398bd9bc7e' 
  AND token = 'tdK3zA00Hm0bOPMj6xuvqmYePwWbDaIhYQMFy4jxWGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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