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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c5ed9be97d63e2dbdef073a60d25df917912f9262121fa7dd83bed775d369b6a' 
  AND token = 'RgWDuvP9IiduoiRFCWza25iMFfy9liq5uQfXqbFDkJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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