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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '25a084a29c7f66e0416cc64054662d2afe5e5c7dda918dea57bae9046bfabf25' 
  AND token = 'leWe4mcGdTw9Iy/hPoVVPByW0sH8WzPyqD1fymJUpcA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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