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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41bc6514e2a15cf79be12c18d96c6af7b1d6cf0519ebcdb321ba6ce04c8d7e9d' 
  AND token = 'pvy1+QY1AEvV8SLz40vpFzwr2DSNtrlCracXxc5JjFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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