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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4df661dde35d2f073c3f13272e847d06f11a22b5d207bf4e4542f7ee3486c330' 
  AND token = '3gnIgm14Q6GhkBs/Jmk8QG0mAVv50xGOAF78XIbpjGQ=' 
  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"
    }
  }
}