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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60254258a37f76da219ea3cdbde4a29eb49329c60ea3a1c165dab6a8f7581a37' 
  AND token = 'KMVxg8wOT+lCm1Pljovbu3LajCDY6wbC4u4Qu56D+AE=' 
  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"
    }
  }
}