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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '588f6a80aa8e0df4de69f8115de97c427cdb9e36df8f02e5ff7206c3bb80e13e' 
  AND token = 'ROTXTRUFZ0mSxIJAYhJS1iL7JoA5RdyYikDfWvTwKvE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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