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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fcc9013175393a75bea9714661e0ac6f82b49f1857ea909d45d21704b27fd2b' 
  AND token = 'hW2C+14douFoMqcPr3gyxZY4lc/GYjbyOfvJt1I491s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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