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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24597a17c22bed4583ab177a920be78ae208918045c0615f5db1bef32d71b9d1' 
  AND token = 'yYmEhM4DEmk7ebRQJlKufbMGh5yn/Iv5eHbfobHSvRc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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