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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c4e162e24b7f1de6ac1a5b3f00ae345becfc022b66a0ec20b29d6ac35a41b4' 
  AND token = '4HHt+sUUgGH91Pm9Hx4PxKeKDl6CNDbOLxbFkaZJN0o=' 
  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"
    }
  }
}