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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29da33d75a41b12c4a19c262b7c0430105d60e2ab1fff00aad0fb3c353f1cd14' 
  AND token = 'xQhZAe52JjC7bg7i6fZH4ncNIu8TlgJeEOOhjizLqQg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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