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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9f3a485ed11df8d1f75cb5f4ebcc78a4b6d78a2e3c1395e4bf3b78ce6e73cd9' 
  AND token = 'aarIvxiS1/hxwbYo+9B8me9BT8yskuKdp8d8bXxEv7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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