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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4e056e16be463929867ac3ec502703d2ae3fd0ef92ab71aac27c9b3bdf1ef86' 
  AND token = 'ta+2eyHP5VAdNYkSyis6W6Xohg9jEVfUt59x0YULbS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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