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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c862cc9525654ad4aaa42306fca269006479603f49c940ffaf4cee9585a9a02' 
  AND token = 'sUtEHT6dmu5rRbcs0l3ARneqGPsQe8RIB9U4E8715vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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