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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd19b8ace8cd8bec02a5e8f9602acf7fd7cdd23e9acc333512cff86e1b7912dad' 
  AND token = '/AI/MxBWij1a/U7oY3KTLszT9Jt2O56UdjQT/xXxAII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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