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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dae0b55a1da1f8af8acfa272bd124da6a6ccc68394ad2a96142d9bea23bb3e0f' 
  AND token = 'vW5StYdQS83PcAOCSTlhGH8L3T+up/7rAdL0mqRoSnw=' 
  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"
    }
  }
}