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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fa6db12b719b4af70aec92cc3fbf9933b35e18df8e1304e59fc7ee1833113f7' 
  AND token = 'aicoOIyl1f2QYhXqu9OLhPCFUkDdk+u7DoWRf2Bddso=' 
  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"
    }
  }
}