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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '023841f37e7a3713de4ea2baa2e914169c08616d3aed832b43d1be8a91901448' 
  AND token = 'z+U1g7oPEWQ1HkcFfJbxm8Gx8xOsDGnR4U9WnHyp7Cc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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