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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '982ae0231a5e70c7d526e563f89de242351c2271ae5f0b22423e9bbf7d1277a1' 
  AND token = 'SuVqRNKvEgNCXe+WMmIgGgP/x/EeP3i5X0H4E2CU9Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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