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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80684c0e27fa3768da1454fcd2520b3e7a4018a464652825d6f53cb080aae392' 
  AND token = 'YshVXlDgeAjaFUjFzf5FlStczUAyVMqrM9brKB6G5z4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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