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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b3b693cde791ded9a7568bf053898b3c3b56766a6670f958e7afc908df794c' 
  AND token = 'ZV6ipWGOkSvMk3g8vsjVMbouR5TAAwj8kSsszywd1Wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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