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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cc5db95ec2f8e393a751b441c506a7056216e7534edc1e812e6bb9503a20292' 
  AND token = 'egsExlfq+bJfbZXkO1xwu0Pdv3LvB04QMqoUlw9FO+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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