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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46899082939f3ea3ea4ee7bbfbd5d7ab209b528b8975b8483723902ce456b615' 
  AND token = '7XvpuUZPrIDy7NiTcHxAHJ2V8RmtbSD+g2PgDPcfN18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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