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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e513c5966c2e096d276385514dc75c934053e491ee0f4b32d7ba0a9de9a4c2f' 
  AND token = 'uG3ApLFOo+6NWJWXxHh4QQo7bGba2zGFz5KYH3B0GdY=' 
  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"
    }
  }
}