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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abdcf26bcf8396d047fc0546364bda3bab39fde0529ca5ecae0c0bb875e664f4' 
  AND token = 'Yke9K7VR6wj1I04SmP3YKHz8KdzSRqjxINoeeVvJSGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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