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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b793042bfc64cc8b5813e33e982a43e4bf878042a63d55508cc3e771f94f97b2' 
  AND token = 'dOoc3xL8xRM4d4099xjWg7WW+qtRD+kDMbu8GdN6Mbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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