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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc396cb393eb904ebef33eb5f986238970297d2c9e0435aa18452aa95d247fc2' 
  AND token = 'EMSBcGDl/maOhC0phTvd8T7E5XALah17ABnZkJz/j0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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