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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05a4f05dc8b24c820f7ef121d5f243753f8311c2456659d723d07b5b20ad1b34' 
  AND token = 'DK5yGiB40zsQNM4F3f/pE6AGlzXb7ihgOwTaEG0shIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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