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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a9dc740b1ea205aaeca741d8bb3958757de3f1a9a1dad4969cffb55596aab31' 
  AND token = 'Z07ZB/bk+UqgjQm8UJnfEtj5ysTsEtsRnIYM3HRMDwg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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