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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2545a8f09eda2bf126886b669f2d179dcdc7a681b82eda9ea1e62b1f937ffff0' 
  AND token = '8Lc5AfIW+pi9m3/8SlmS/FQwQmhkddJsm6uyrxldmvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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