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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70efdbccee2a8c20a92dea6d6423784a13cc013d9641d86fc3df4855b3c9a948' 
  AND token = 'MyuKHi2cx4x68QEhZhy7ZYwCyKl4JtdiiSiBX3juj/g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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