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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd76b1836f32cccd9294602667c136e8a5f3cb4603f44194c07a8966eed766250' 
  AND token = 'xEGSNXJrLItVkFHbeBVNH9enBJC2JvVDS2I6RunM+10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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