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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fab98f9912b29c243a58c5284745bc9ac78042caf9b4ca4600c21dba290facd' 
  AND token = '1b71/QH92lVkHNC2iuA1/okVIjzoms37oiCf6yglE2g=' 
  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"
    }
  }
}