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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55deda5d90bdb28858e2fb8fbf4b8ce097e5e4843e5f51c3137abf81a791a62f' 
  AND token = 'PB0H3wBN9o1Z/hAvWZy3ewldO5v7H4eJkoSboBVt7kM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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