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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74a7e3a1df3e48fe45cf35b1a0f17eba8ab4599e749df4a447db098137311bef' 
  AND token = '9RWepRXLYFWM28dAxSICUbLhwm1NBrZXJnKIf6BUOWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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