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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e03d16ff1a1eb7cc6fc3290e79310908fa8143fdb894a02516108f6ae45ea8' 
  AND token = 'IUNvXy4Wy3DG3UzKpqCgBM8eSfrTDBLETp9FUxRx11c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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