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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '059b2e5e3ce946f8cb6bb1326b87dcfc2667741e2ee93bd0ab06b228eb50ce31' 
  AND token = 'pttkz7WPx64M7Hq0S/JAmCHEmza1K+VmBYjiGO2AQGk=' 
  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"
    }
  }
}