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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a607b5c2a1286b75ec76c85d972745f9d81f45365877a89cc3930ac4abb2db2' 
  AND token = '/hWcT+b6A/yJbsCK6uqXLEdhy8+LeryF3GltSmjW4Ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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