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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5e61babbc86c5ff6e9e59a09a45dbbc056237e189d5e9959210d81b4ab13a15' 
  AND token = 'GNAa4A2sLhNy+HpHc9eVgX6PBmtVdZNvZh49DRK05Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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