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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13f9e051d3b0a30234fd0c9b0c34fd9ea760b5e5c0c219e63e3fbac384f71c1d' 
  AND token = 'TLODuRHLKJgMn/tIXQNwwx2jU+OTrIbxet8CyPJtHtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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