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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19bbe99893b33bc9ee985cb67c1a90f50dc0c8397acf1e481c8182d7580f3c36' 
  AND token = 'fsIum9oljRZU8kNUZoRwMzxfAVaKF1WspEiyfm135IY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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