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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2801a2532dad26379e2b53dc749cf21de2a72fa9105ae3853a8beeeb8c924ae9' 
  AND token = 'XeyUFKh8eGGmB4nG6aMb6dMTbCLp2RzZeKTyrrG7ZeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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