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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e9a1f7db62120a9e291d0294d754520da64647c68593c238ad82b37504b2a6e' 
  AND token = 'U8hLlggfZ3tM2aEDRn4HXZ9yQHBcOX43jzTaQqhQBmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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