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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd5c935c47a2e9a1c037f580956be750c7b7ea8d870c19fa7b3166661e8d59b6' 
  AND token = 'blnNEaSaCzxD5JLGzpFe7SRn1tCacYLmXVW6H7l1/QI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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