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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f750513c3c68b1c60ee5e8be7ec5f8020396540c2488a56c5b27d4fd79750001' 
  AND token = '6gDAQpibgDfIP1Vg2lDkIfYY/nhuitBDHPcJMFBoPuE=' 
  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"
    }
  }
}