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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e481974338cbc07e2690cfa2a1460b3a7a88aa9efc58c9ce6daca619c912b41' 
  AND token = 'p/tZJC9+0ngolP45+M34XVo1Zbzb100Rgl3TGnM0hlg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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