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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc553cec1b989aa8b4bf3dc81d2017a8a78b9ba9a595777f339fbfcf982b8211' 
  AND token = 'OSEO1uKYk8z2qP6k3sKcc2JBFC8Z51lpaqJrsNq5oiE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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